Lionel Barrymore is the first believed to have used the "arrrgh" in the first film of Treasure Island from 1934 in an iconic version of Billy Bones. In fact, many believe Barrymore created the first archetype of pirate speak. Actor Robert Newton, who portrayed Long John Silver in the 1950 Disney film Treasure Island and then in the 1954 film Long John Silver, is described as the "patron saint" of Talk Like A Pirate Day. Newton was a native of Dorset, and it was his native West Country dialect, which he used in his portrayal of Long John Silver and Blackbeard, that has become the standard "pirate accent".
Can you say ARRRRRGH?